DIRECT SHEAR TEST

a$)$ Explain the test procedure briefly and sketch the test set up$.$

b$)$ The following readings were taken in two sets of sets of tests $($ under normal load N$\_1=500$N and N$\_2=900$N $)$ using a shear box of $70$mm x $70$mm in cross$-$sectional area containing specimen of dry sand.

$1).$Calculate shearing resistance for each step

$2).$Plot the shearing resistance against horizontal displacement by simple sketch.

$3).$Show the $($ peak$)$ angle of internal friction and comment on type of soil $($Do not calculate the angle!$).$TEST$-1$ Normal Load

TEST $-2$ Normal Load